By D.K. Platt
ISBN-10: 1859573800
ISBN-13: 9781859573808
Engineering and excessive functionality polymers hide a large spectrum of fabrics which are valued, among different issues, for his or her temperature resistance, power, dimensional balance and chemical resistance in lots of challenging purposes. This new industry file from Rapra, discusses their key functionality homes, the traits in fabric advancements, and their program in automobile, electric & electronics, business, patron items and different markets, together with clinical
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Sample text
They also offer high chemical resistance to acidic and salt solutions, and good resistance to detergents. The main drawbacks of PSU and PES are their susceptibility to stress cracking in certain solvents and poor weathering properties. 25 Engineering and High Performance Plastics Market Report PES and PSU resins are often reinforced with glass or carbon fibre for additional strength. 11 presents a comparison of the performance properties for 30% glass fibre-reinforced grades of PSU and PES. a. a.
These polymers consist of rigid rod-like macromolecules, which align in the melt to produce liquid crystal structures. If a liquid crystal polymer melt is subjected to shear or stretching flow, as in the case of all thermoplastic processing operations, then the rigid macromolecules order themselves into fibres and fibrils, which are frozen when the melt cools. This is how the specific morphology of LCP is formed in the solid state. 12 presents a comparison of the performance properties for unfilled, 30% mineral filled and 30% glass fibre-reinforced grades of liquid crystal polymers.
Polyphenylene ether (PPE) is obtained through oxidation-coupling polymerisation of its monomer, 2,6-xylenol, in the presence of oxygen. The modification of these resins involves blending with a second polymer usually polystyrene or polyamide. By varying the blend ratio and other additives, a variety of grades are produced. Unmodified, these polymers are characterised by regular closely spaced ring structures (phenyl groups) in the main molecular chain. This feature along with strong intermolecular attraction causes extreme stiffness and lack of mobility.
Engineering and High Performance Plastics by D.K. Platt
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